42 TRANSACTIONS OF THE 
to wilt and drop from the plant are those at the top. 
When the stem is cut it reveals either a dry decayed or a 
moist decayed condition. Sometimes the young tubers 
carry black spots on their surface and when cut near the 
stem end, the medullary rays often show dark rings. 
The disease spreads rapidly in hot weather with the land 
in a wet or continued wet condition. All farm and gar- 
den plants are susceptible to the disease except the 
cereals. Corn is immune and should be planted in gar- 
dens where this disease is present. 
The root crop when attacked does not show the dis- 
ease until well developed. The lower portion of the root 
decays and the decayed portion gradually works up 
toward the top; the leaves at last wilting and drying up 
in a similar manner. 
In this city where fields were attacked by Blackleg 
as much as 75 percent to 90 percent of the crop was des- 
troyed. 2 
Remedy: No absolute remedy is known. The dis- 
ease can be held in check by careful irrigation and rota- 
tion of crops. Fields where the disease is known to be 
present should be planted to a cereal crop for two years; 
corn is probably the best. Lime and strong nitrogenous 
manures, especially nitrate of soda and sulphate of 
ammonia should not be used on infected land. Bordeaux 
mixture does not seem to do much good. Dr. Otto Appel 
says, “Potatoes, beans, carrots, parsnips, cucumbers, tur- 
nips, vegetable marrow, beets and mangolds are suscep- 
tible to this disease and should not be cultivated for two 
years on land where the disease occurred. 
CORN-ROOT WEBWORM (Genus (Crambus). 
The corn-root webworm should not be presented to 
the Utah Academy of Science, since a number of descrip- 
tions have been written relative to it. The only reason 
for presenting the subject at all is to show that the pest 
has become established in Utah and agriculturalists 
should always be on the outlook for it. The history and 
description of the insect can be found in any good text 
on the subject, but in order more forcibly to bring the 
pest to the attention of the people of Utah this paper will 
